74ACT253SJX

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The 74ACT253SJX is a logic-signal switch, multiplexer and decoder. Designed by Texas Instruments, it is part of the ACT logic family that is made up of low power CMOS logic ICs.

The 74ACT253SJX is a high-speed 8-bit multiplexer with a 3-state buffer. It is capable of operating at a maximum clock frequency of up to 100 MHz. The IC is a non-inverting multiplexer that can select between two groups of four pins called channels. It can handle both logic high and logic low signals and its 3-state output buffer can source and sink up to 20mA on TTL logic levels. Each channel of the multiplexer is activated by a logic low signal. When one of the inputs is activated, the corresponding output will reflect the input signal state at the independent inputs.

This device is mainly suitable for applications such as digital conversion between video signals, memory interfacing and D/A/A/D switching. Its 3 state outputs are particularly suitable for bus-oriented applications such as in data and address buses.

The working principle of the 74ACT253SJX multiplexer is based on the four-way data selector logic. A logic "low" at the select input allows data transfer from the input data select lines to the output line. A logic "high" at the select input does not allow data transfer. The 3-state buffer provides active pull up/down to the output line and prevents data-bus contention. Depending on the application, the output can be kept in the active up or down conditioned by the enable input.

This device is often employed in applications with high-speed switching requirements. When used with a logic low enable, the 74ACT253SJX can be used as a 16-to-1 multiplexer which provides fast switching times and low power consumption.

The 74ACT253SJX can also be used as a demultiplexer, in this mode the logic low enable and select inputs are combined and form the input data select lines, which then become the address lines of the corresponding register. The device will then transfer data from the data input ports to the respective data output ports.

The 74ACT253SJX is a versatile and high-speed multiplexer and decoder that is available in various package types, including DIP, SOIC and PLCC packages. It is a highly reliable, cost-effective device for fast data control and can be used in a wide range of applications.

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